Sub panel Installation

In this how to install a sub panel installation I will guide you through the complete installation of a subpanel step by step.

The first question is why are you installing a sub panel. There are either one or two reasons to do this. One because you need more room in your existing panel and in that case if your existing panel is old this would be a great time to just upgrade your current service. Newer 200 amp main panels hold a lot more circuits / breakers.

Two, because you need to bring more power somewhere else like a garage you just built or an addition or even in some cases a finished basement. Either way, you want to install a sub panel. Ok. So let’s get going.

First: Where do you plan on placing the new sub panel? If it’s right next to you main panel that’s one thing, but further away like in that new garage you just built 100 feet away you will certainly want to figure in voltage drop.  I can’t get too much into that because ever setup would be different.

Second: How many amps are you needing to the new sub panel. So let’s say you need 50 amps. Well, it’s not brain surgery, 50 amp sub panel, 50 amp wire, 50 amp breaker in existing main panel. See wasn’t that easy.

bonding screw

bonding screw

 

Neutral Bonding Jumper: 

This is very very important. This is also known as a bonding screw. It may even be green. This screw is used to bond the neutral coming in the main panel to the case “panel” itself. however in a sub panel, the neutral buss bar must be  totally isolated from ground. The very first thing the electrical inspector is going to look for is if the sub panel is bonded or not.

Now as far as wiring the panel. You would wire it just like any other panel. Hot leads to the breakers, grounds to the ground buss bar and neutrals to the neutral buss bar.

 

 

How to Install a Subpanel

Watch this video on YouTube.

 

You would install a 220 volt two pole breaker in the main existing panel. Whatever the amperage is that you’re using. That breaker gets installed in the main panel of course. This is now the main breaker to your sub panel. By turning this breaker on or off will control the entire subpanel.

Always remember safety first. Turn the main power off before removing panel covers or touching any wires.

You will need a 4 wire, wire between each panel. No matter how the panel is, this part will always stay the same. You will have two hots, one neutral and one ground. Two hots will go from the new breaker you just installed in the main panel to the sub-panel. A neutral will go from the neutral bus bar in the main panel to the NON bonded buss bar in the sub panel and a ground from the ground buss bar in the main panel to the buss bar in the new sub panel.

Subpanel

Subpanel

 

 

 

wire size 

 

Use the wire size calculator to find the correct wire size 

Electrical Wire Size Calculator

 

Sub panel Installation
5 (100%) 12 votes

61 Comments

  1. Dominick Amorosso January 16, 2017
  2. William Burrows January 16, 2017
  3. Dominick Amorosso January 8, 2017
  4. Justin January 7, 2017
  5. Dominick Amorosso August 30, 2016
  6. William J Vacanti August 28, 2016
  7. Dominick Amorosso April 16, 2016
  8. Joe April 15, 2016
  9. Dominick Amorosso April 14, 2016
  10. Joe April 14, 2016
  11. Dominick Amorosso April 14, 2016
  12. Joe April 14, 2016
  13. Dominick Amorosso January 13, 2016
  14. Dominick Amorosso January 13, 2016
  15. Bryan January 12, 2016
  16. Tom January 12, 2016
  17. Tom January 12, 2016
  18. Dominick Amorosso January 11, 2016
  19. Bryan January 11, 2016
  20. Dominick Amorosso January 10, 2016
  21. Tom January 9, 2016
  22. Dominick Amorosso January 1, 2016
  23. gary January 1, 2016
  24. Dominick Amorosso November 13, 2015
  25. Keith Graham November 12, 2015
  26. Dominick September 29, 2015
  27. Dwight September 20, 2015
  28. Dominick September 17, 2015
  29. Peter September 14, 2015
  30. Andy May 8, 2015
  31. William May 1, 2015
  32. Jerry Finziq April 20, 2015
  33. Dominick April 8, 2015
  34. Michael April 2, 2015
  35. Dominick November 30, 2014
  36. Anonymous November 26, 2014
  37. Dominick October 8, 2014
  38. Tom October 1, 2014
  39. Dominick August 3, 2014
  40. Rausty August 2, 2014
  41. Dominick June 19, 2014
  42. Sergei June 17, 2014
  43. Dominick April 12, 2014
  44. Jo H April 11, 2014
  45. Dominick March 29, 2014
  46. Ron March 29, 2014
  47. Dominick January 7, 2014
  48. Howard January 7, 2014
  49. Dominick November 23, 2013
  50. Greg November 23, 2013
  51. Dominick November 13, 2013
  52. Nelson November 10, 2013
  53. Dominick September 20, 2013
  54. victor September 19, 2013
  55. victor September 19, 2013
  56. Dominick September 9, 2013
  57. Dominick July 29, 2013
  58. Ray July 16, 2013
  59. Dominick June 20, 2013
  60. Tone June 17, 2013
  61. Steve June 17, 2013

Add Comment